<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <title>css设置网页高100%宽100%占满屏幕</title>
    <meta name="description" content="">
    <meta name="keywords" content="">
    <style type="text/css">
        *{
            margin: 0;
            padding: 0;
            -moz-box-sizing: border-box;
            -webkit-box-sizing: border-box;
            box-sizing: border-box;
        }
        html {
            min-height: 100%;
            _height:100%;
            height:100%;
        }
        body {
            min-height: 100%;
            _height:100%;
            height:100%;
            /*background: #ff0000;*/
        }
        #all {
            background: #EEE;
            border-left: 1px solid #ff0000;
            border-right: 1px solid #ff0000;
            padding: 0 20px 0 20px;
            margin: auto;
            font: 1.5em arial, verdana, sans-serif;
            width: 100%;
            min-height: 100%;
            _height:100%;
        }
        #header,#pagefooter,#container {
            margin: 0 auto;
            width: 85%;
            border: 1px solid #000000;
        }
        #content {
            float: right;
            width: 66%;
            border: 1px solid green;
        }
        #side {
            float: left;
            width: 33%;
            border: 1px solid blue;
        }
        .clearfix::before {
            content: "";
            display: table;
            width: 0;
            height: 0;
            overflow: hidden;
        }
        .clearfix::after {
            content: "";
            clear: both;
            display: table;
            width: 0;
            height: 0;
            overflow: hidden;
        }
        .clearfix {
            zoom: 1;
        }
    </style>
</head>
<body>
<div id="all">
    <div id="header">
        头部
    </div>
    <div id="container" class="clearfix">
        <div id="content">中部内容</div>
        <div id="side">中部侧边</div>
    </div>
    <div id="pagefooter">
        我是底部
    </div>
</div>
</body>
</html>